Ear Embryology Questions

The saccular region of the otic vesicle gives rise to the cochlear duct, which houses the spiral
organ of Corti.

The utricular region of the otic vesicle gives rise to the endolymphatic sac and duct and
semicircular ducts.

The tubotympanic recess is derived from pharyngeal pouch 1. It gives rise to the tympanic
cavity and the auditory (eustachian) tube; the auditory tube interconnects the tympanic cavity
with the nasopharynx.

The perilymph enters the subarachnoid space of the posterior cranial fossa via the cochlear
aqueduct, which contains the perilymphatic duct.

The stapes is innervated by CN VII.

The otic vesicle arises from an invagination of the surface ectoderm called the otic placode.
The otic vesicle is found adjacent to the rhombencephalon.

The middle ear cavity develops from pharyngeal pouch 1 as it evaginates to form the tubotympanic recess

The cochlear duct is derived from a thickening of the surface ectoderm called the otic
placode.

he auricle (pinna) of the external ear is innervated by cranial nerves V3 (mandibular division), VII, IX, and X; cervical nerves C2 and C3 also innervate the auricle.

Pharyngeal groove 1 gives rise to the external auditory meatus.